<template>
  <div>
    <el-row>
      <el-col :span="22">
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
      </el-col>
      <el-col :span="1">
        <i class="el-icon-arrow-left" @click="goBack"></i>
      </el-col>
    </el-row>

    <el-card>
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <el-form
        :model="goodsListForm"
        :rules="goodsRules"
        ref="goodsRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
          v-model="activeIndex"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="goodsListForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="goodsListForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="goodsListForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="goodsListForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                expand-trigger="hover"
                v-model="goodsListForm.goods_cat"
                :options="goodsCategoryList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadURL"
              list-type="picture-card"
              :on-preview="handlePictureCardPreview"
              :on-remove="handleRemove"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <i class="el-icon-plus"></i>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor
              v-model="goodsListForm.goods_introduce"
            ></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
      :visible.sync="previewVisible"
      size="tiny"
      title="图片预览"
      width="50%"
    >
      <img :src="previewPath" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    var checkNum = (rule, value, cb) => {
      // 验证不能小于等于0
      if (value <= 0 || isNaN(Number(value))) {
        return cb(new Error('只能输入数字且不能小于或等于0'))
      }
    }
    return {
      activeIndex: '0',
      goodsListForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        attr: [],
        pics: [],
        goods_introduce: ''
      },
      goodsRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
          { validator: checkNum, trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
          { validator: checkNum, trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
          { validator: checkNum, trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      goodsCategoryList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      manyTableData: [],
      onlyTableData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },

  created() {
    this.getCateList()
  },
  computed: {
    cateId() {
      if (this.goodsListForm.goods_cat.length === 3) {
        return this.goodsListForm.goods_cat[2]
      }
      return null
    }
  },

  methods: {
    // 返回上一级
    goBack() {
      this.$router.go(-1)
    },

    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.goodsCategoryList = res.data
    },

    // 离开当前标签
    beforeTabLeave(current, old) {
      if (old === '0' && this.goodsListForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // tab被选中触发
    async tabClicked() {
      // 此时访问为动态参数
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }

        // 这里将attr_vals中的空格或逗号划分
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(/\s+|,/)
        })
        this.manyTableData = res.data
        console.log(res)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败！')
        }

        this.onlyTableData = res.data
        console.log(res)
      }
    },
    // 当选中节点变化触发
    handleChange() {
      // 当选中的商品分类不是三级商品则重置为空
      if (this.goodsListForm.goods_cat.length !== 3) {
        this.goodsListForm.goods_cat = []
      }
    },
    // 处理图片预览效果
    handlePictureCardPreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      console.log(file)
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中，找到这个图片对应的索引值
      const i = this.goodsListForm.pics.findIndex((x) => x.pic === filePath)
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.goodsListForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response)
      // 1.拼接一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象加入pics中
      this.goodsListForm.pics.push(picInfo)
      console.log(this.goodsListForm.pics)
    },
    // 添加商品
    add() {
      this.$refs.goodsRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }

        // 执行业务逻辑,使用lodash深拷贝
        // 这里goods_cat前后端格式不一致,故使用深拷贝复制
        const form = _.cloneDeep(this.goodsListForm)
        form.goods_cat = form.goods_cat.join(',')

        // 处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.goodsListForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })

        form.attrs = this.goodsListForm.attrs
        console.log(form)

        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }

        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  }
}
</script>
<style lang='less' scoped>
.el-col-1 {
  text-align: right;
}
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
